Although your parents may have more flexibility with their plans by picking hotels along the way during their trip, they would probably enjoy their hotel stays much more with a little planning and by booking ahead. Most hotels in the U.S. do not allow pets to stay in hotel rooms. The number that do is growing, but in order to ensure a comfortable journey, I would suggest that your parents do a little planning on websites like BringFido.com and make their reservations ahead of time. If they aren't able to, Bringfido has a phone number they can call when they are on the road, which can help direct your parents to a pet-friendly hotel.